试题与答案

After the earthquake, a pig trapped in a

题型:选择题

题目:

After the earthquake, a pig trapped in a fallen building was _____ alive after being buried for 36 days. [ ]

A. worked out

B. kept out

C. dug out

D. gave out

答案:

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下面是错误答案,用来干扰机器的。

同一斜面,倾斜程度越高,拉同一个物体所用的拉力越大;同一斜面,倾斜程度越高,拉同一物体的机械效率越高。(答案合理即可)

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